<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<script>
    var socket;
    /*首先判断当前浏览器是否支持websocket*/
    if (window.WebSocket){
        socket=new WebSocket("ws://localhost:7000/hello")
        /*相当于channelReader 收到服务器端回送的消息*/
        socket.onmessage=function (ev) {
            var rt=document.getElementById('responseText');
            rt.value=rt.value+"\n"+ev.data;

        }
        /*相当于连接连接上*/
        socket.onopen=function (ev) {
            var rt=document.getElementById('responseText');
            rt.value="连接开启了....";
        }

        /*相当于连接断开了*/
        socket.onclose=function (ev) {
            var rt=document.getElementById('responseText');
            rt.value=rt.value+"\n"+"连接关闭了.....";
        }
    }else{
        alert("当前浏览器不支持WebSocket，请升级浏览器或改用最新版的Chrom浏览器！");
    }
    /*发送消息到服务器*/
    function send(message) {
        if (!window.socket){/*先判断socket是否创建好*/
            return;
        }
        if (socket.readyState==WebSocket.OPEN){
            /*通过socket发送消息*/
            socket.send(message);
        }else {
            alert("连接没有开启！");
        }
    }
</script>
<body>
    <form onsubmit="return false">
        <textarea name="message" style="height: 300px;width: 300px"></textarea>
        <input type="button" value="发送消息" onclick="send(this.form.message.value)">
        <textarea id="responseText" style="height: 300px;width: 300px"></textarea>
        <input type="button" value="清空内容" onclick="document.getElementById('responseText').value=''">
    </form>
</body>
</html>